If `sintheta=1//2,cosphi=12//13,` where `theta` lies in the second quadrant and `phi` in the fourth then : `tan(theta-phi)=....`

If `sintheta=1//2,cosphi=12//13,` where `theta` lies in the second quadrant and `phi` in the fourth then : `tan(theta-phi)=....`
A. `(12+5sqrt3)/(26)`
B. `((12sqrt3+5))/(26)`
C. `(5sqrt3-12)/(12sqrt3+5)`
D. none of these

If `sintheta=1//2,cosphi=12//13,` where `theta` lies in the second quadrant and `phi` in the fourth then : `tan(theta-phi)=....`

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